Finding the Fourth Proportional to 1,285.47, 1,918.35 and 1,147.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,285.47 : 1,918.35 = 1,147.05 : x
2. Step 2: Convert to fraction form
   1,285.47/1,918.35 = 1,147.05/x
3. Step 3: Cross multiply
   1,285.47x = 1,918.35 × 1,147.05
4. Step 4: Simplify right side
   1,285.47x = 2,200,443.37
5. Step 5: Solve for x
   x = 2,200,443.37/1,285.47
6. Step 6: Final answer
   x = 1,711.78